Coupling and valve



.luner9, 1931.

w. R JOHNSON COUPLING AND VALVE Filed April 1, 1930 INVENTOR ATTORNEYS Patented Jugg v silswlzj' .A iplication'filed-April 1, ie'soflsria m.- 40341; I

M This invention relates toa hose orpipe coupling, embodyinganautomatic valve for use in conducting fluid pressure. The inven-i tion has as one of its field of uses the cone '5 nection ofvacuum lines employed in operating the brakes of automotive trailers. 1 Mo tor vehicles serving as tractorsffor trailers are commonly equipped with a vacuum line foroperating theb-rakes. Trailers areflikelo wise equipped with such vacuum controlled brakes, as the motor Vehicle carries the source v of vacuum, the, trailer line and motor line' are'provided with a coupling. The use of such a coupling necessitates a'valve to close 1.5 the vacuum line whenIthe'trailer is detached;

Quick couplings are commonly employed and automatic valves have been provided which are opened by engaging the elements of the coupling in coupled positionandautomati- 2 cally close on uncoupling. "The present invention relates to such a device. I In such devices it is the current practice toemploy resilient means to maintain the valve seat-ed in uncoupled position. However, vibration 25 causes the valve to chatter and leave itsseat;

This causes loss of vacuum in the line and. seriously affects the operationof the brakes.

The primary object of the "present invention is'to provide an automatic valve which: 0 will remain closed under vibrational moves ment and to this-'endan auxiliary valveseat is provided. 1 i

This object together with other objects and. corresponding accomplishments are obtained 3 byr means ofsthe embodiment otmy-inven, tion' illustrated in thev accompanying; draw ings, in Which:@

, Fig. 1 is a longitudinal section through'fa coupling, the valve'being shownin unseated position; Fig. 2 is a. section as seen on "the line 2+2 of Fig. '1; Fig. 3' is a perspective... view of the auxiliary seat; and Fig. 4, is a; fragmentary sectional view showing: the valve partially unseated. I V f' 1 Referring with, more particularity to the drawings, 5 marks. the vacuumdine adapted to be connected toth'e sourcejo if vacuum, such as on a motor vehicle. Thevacuum line on the adjacent vehicle such as a trailerfis delisa coupling which in con 5 section of the stem is such? that a i is provided between :the bore of 'the'seat ll; Normally the auxiliary seatis. fiat as shown in Fig. 1. .1 Threaded 'ontc the I ber 20 fhavin the spring 17 will seat. the-valve.,

I 'llhe device comprises broadly' 'acoupling"? .1. ha'vingfa valve member and aicontact'mem a part of the entirevacuum line. I I q Threadedontothe tube 5 is 'a valve stem shell 7. The otherend of theshell is shoul-i dered and-provided with threads to-receive -valv'e stem member 8. lhe'valvestem'mem berhas'ap'assa'ge 9 enlargedin diameter at the valve end as 'ih'dicated by'lO, and-is pro vided ith-a tapered valve seat 1'1. Glamped between thestem member and the valve shell 'Z is an auxiliaryseat 12 of' pliant material, suchas'leather. There is 'a bore l3 through WlllOlIthQ valvestem passesp V p *QMounted "ing the valve chamber isa valve head 14 having a seating 'ia'ce corresponding to' the tapered'valve' seat 11*an'd provided-f with'a stem 15 and astud 16.

passageway the tubular part ofthe stem member-8 and the stem it I it will depress i'the' auxiliary valve seat 12 andform a liner for v tubular end ofstein' member Sis acoupling-r member 18 having a gasketpacking IQ and adapted to-be engaged or'coupledtoiai mem i H packinggasket 21.],Mem-I hers- 18' and'20 maybe of any well known con-f and unseating-the valve in I coupledpositio'n; I hen members 18 and 20 are disengaged,

her and as "shown these members" are built I sary to. grind the valve head or'seatQ If.

asshown'in Fig It will be noted that the inneredge of auxiliary'fse'at 12'overhangs the valve port and chamber 10. This pro;

v noted by Intermediate the lines "videsiforan area'u'pon which pressure I f Pled p'osition j nh r I if j The cross,

Z0; 5 self. A compression spring l'l-tends to seat the valve. When seated 'ventionalftype of coupling,- i,Member20iis mounted uponacontact extension 22 having abridge 23 for engagingtheend of stem 15 Y up of parts for convenience inassemblageRQ-Q' g Due to the" fact that a leather auxiliaryseat I.

is usedwh-ich serves as a liner, it is not neces- 3 act to cause the auxiliary valve to initially start away from seat 11 and follow the valve 4 head 14.. Thus the valve is maintained closed until positively unseated as shown in Fig. 1. 5 vWhat I claim is-: V r 1. A valve coupling embodying two sections'forforming a part of a fluid pressure line, one'of'said sections constituting a valve 7 member and the other a contact member: said 10 valve member having a valvecage chamber and a valve stem chamber with a main valve seat interposed between the chambers, an auxiliary sealing seat of limp material disposed over said main-seat with a freeedge I adapted to clear the face thereof and dc pressi-ble. onto-the face of said seat toform aliner therefor; a valve having a stem, means tending to seat. said valve, said auxiliary ,seat being engageable with andfollowing said valve: in partially unseate'dposition to. seal Y the latter; said contact member having means toengage said stem when in;coupled relationandiunseat said valve from both seats.

5 QJA; valve coupling embodying two sec. 5 tions for forming a part of a fluid pressure line,' one of said sections constitutinga valve member' and the other a contact member: said a valve member having a valve cage chamber and-a valve stem chamber with-a tapered valve seatinterposed between the chambers, an auxiliaryscaling seat of limp material disposed over said tapered seat normally in flat position clearing the face of said tapered s eat; and depressible onto the face of said taperediseat to form a liner therefor; a valve having ahead corresponding to the face of said tapered seat and a stem, means tending to'seat sai'd' valve said-auxiliary seat being engageable with and following said valve in I vpartiallyunseated position to seal the latter 1 a said contact member having means to engage said stem when in coupled relation and unseat saidvalve from both seats. 1 Inwitness that I claim the foregoing I 5- have hereunto subscribed my name this 19th day of March, 1930. v P j j WAYNE R. JOHNSON. 

